Pub Date : 2016-06-01DOI: 10.1109/ISFEE.2016.7803149
M. Marinescu, N. Marinescu, S. Kuhn
One of the largest volume applications of permanent magnet materials are loudspeaker systems. High performant loudspeakers can be obtained by using rare earth permanent magnets with a high residual flux density, as for instance NdFeB. Because such devices are produced in a very large quantity and because the rare earth permanent magnets are quite expensive, it is very important for the manufacturer to keep the volume of the magnetic material used as low as possible. This aim can be achieved by using design methods to optimize the magnetic circuit of the loudspeaker, i. e. to obtain a given flux density in the air gap with a minimum volume of magnetic material. Prof. A. Timotin has done in this respect pioneering work. He and one of the authors of the present work have calculated the magnetic flux in the air gap as well the leakage fluxes of a loudspeaker system by solving analytically the magnetic potential equation with given boundary conditions. Also they have formulated certain constraints on the geometrical parameters of the system to be optimized. However the analytical solution could be obtained only under simplifying assumptions which practically are fulfilled only approximately. Such limitations can be avoided by using numerical methods for computation of the magnetic field. In this work we present the optimization of a large class of magnetic circuits for loudspeaker systems by using high precision numeric finite-elements-method computations.
{"title":"Optimization of magnetic circuits for loudspeakers 1970 and now","authors":"M. Marinescu, N. Marinescu, S. Kuhn","doi":"10.1109/ISFEE.2016.7803149","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803149","url":null,"abstract":"One of the largest volume applications of permanent magnet materials are loudspeaker systems. High performant loudspeakers can be obtained by using rare earth permanent magnets with a high residual flux density, as for instance NdFeB. Because such devices are produced in a very large quantity and because the rare earth permanent magnets are quite expensive, it is very important for the manufacturer to keep the volume of the magnetic material used as low as possible. This aim can be achieved by using design methods to optimize the magnetic circuit of the loudspeaker, i. e. to obtain a given flux density in the air gap with a minimum volume of magnetic material. Prof. A. Timotin has done in this respect pioneering work. He and one of the authors of the present work have calculated the magnetic flux in the air gap as well the leakage fluxes of a loudspeaker system by solving analytically the magnetic potential equation with given boundary conditions. Also they have formulated certain constraints on the geometrical parameters of the system to be optimized. However the analytical solution could be obtained only under simplifying assumptions which practically are fulfilled only approximately. Such limitations can be avoided by using numerical methods for computation of the magnetic field. In this work we present the optimization of a large class of magnetic circuits for loudspeaker systems by using high precision numeric finite-elements-method computations.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"229 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126030248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-06-01DOI: 10.1109/ISFEE.2016.7803180
Y. Cheng, Ching-Hwa Cheng
In its early stages, cancer does not appear very different from the surrounding areas. Inexperienced physicians do not always accurately locate all cancer areas suitable since there are similarly colored and outlined organ surfaces. However, potential early-stage cancer has certain surface symptoms in terms of the color and the distribution of blood tubes. The main purpose of this work is to provide information concerning the identification of early-stage cancer during endoscopic examination. The proposed algorithm has been developed thorough image processing techniques, thereby incorporating and adjusting the statistical value to determine correct lesion recognition. There is 80% in accuracy to allocate the suspect lesion location from the three video experiments.
{"title":"Potential early-stage cancer identification technique during endoscopic examination","authors":"Y. Cheng, Ching-Hwa Cheng","doi":"10.1109/ISFEE.2016.7803180","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803180","url":null,"abstract":"In its early stages, cancer does not appear very different from the surrounding areas. Inexperienced physicians do not always accurately locate all cancer areas suitable since there are similarly colored and outlined organ surfaces. However, potential early-stage cancer has certain surface symptoms in terms of the color and the distribution of blood tubes. The main purpose of this work is to provide information concerning the identification of early-stage cancer during endoscopic examination. The proposed algorithm has been developed thorough image processing techniques, thereby incorporating and adjusting the statistical value to determine correct lesion recognition. There is 80% in accuracy to allocate the suspect lesion location from the three video experiments.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"79 3-4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131495621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-06-01DOI: 10.1109/ISFEE.2016.7803222
V. Fedorov, N. Malyutin
A strip line made on the basis of carbon fibers is investigated. The line is included in the interruption of an asymmetric strip line, and is implemented as a tape made of carbon fibers on a dielectric substrate. Experimental frequency and pulse characteristics are obtained. Simulation of the line in a quasi-T approach is carried out. Primary line parameters are obtained using the extraction method by comparing experimental and theoretical frequency and pulse characteristics. The type of frequency dependence of the line resistance is established. Weakly manifested nonlinear properties under harmonic and pulse action are experimentally found.
{"title":"Nonlinear properties of a strip transmission line based on carbon fiber","authors":"V. Fedorov, N. Malyutin","doi":"10.1109/ISFEE.2016.7803222","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803222","url":null,"abstract":"A strip line made on the basis of carbon fibers is investigated. The line is included in the interruption of an asymmetric strip line, and is implemented as a tape made of carbon fibers on a dielectric substrate. Experimental frequency and pulse characteristics are obtained. Simulation of the line in a quasi-T approach is carried out. Primary line parameters are obtained using the extraction method by comparing experimental and theoretical frequency and pulse characteristics. The type of frequency dependence of the line resistance is established. Weakly manifested nonlinear properties under harmonic and pulse action are experimentally found.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"196 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124382640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-06-01DOI: 10.1109/ISFEE.2016.7803171
Maria-Lavinia Iordache, Marilena Stănculescu, M. Iordache, D. Niculae, V. Bucata
This paper presents a procedure for wireless power transfer system (WPTS) parameter identification using ANSYS Extractor Q3D Program. For this, ANSYS Extractor Q3D Program is used to compute the C, L, R and G matrices, for different configurations, structures, frequencies and distances between coils. C and G - the matrices that are generated by the software from the field simulator outputs - are in a Maxwell matrix format. Since a standard SPICE component has only two terminals, the software derives a SPICE matrix format from the Maxwell capacitance and conductance elements. For the inductance and resistance matrices the both formats have the same structure. If, for each two magnetic coupled resonators we keep the same relative position between the two coils, the same number of turns, the same geometrical dimension of the conductors and the same conductor materials, but we change their structures and configurations, finally, we can select the solution which determines the optimal performances of the WPTS.
{"title":"Parameter identification of magnetic coupled resonators in power wireless transfer systems","authors":"Maria-Lavinia Iordache, Marilena Stănculescu, M. Iordache, D. Niculae, V. Bucata","doi":"10.1109/ISFEE.2016.7803171","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803171","url":null,"abstract":"This paper presents a procedure for wireless power transfer system (WPTS) parameter identification using ANSYS Extractor Q3D Program. For this, ANSYS Extractor Q3D Program is used to compute the C, L, R and G matrices, for different configurations, structures, frequencies and distances between coils. C and G - the matrices that are generated by the software from the field simulator outputs - are in a Maxwell matrix format. Since a standard SPICE component has only two terminals, the software derives a SPICE matrix format from the Maxwell capacitance and conductance elements. For the inductance and resistance matrices the both formats have the same structure. If, for each two magnetic coupled resonators we keep the same relative position between the two coils, the same number of turns, the same geometrical dimension of the conductors and the same conductor materials, but we change their structures and configurations, finally, we can select the solution which determines the optimal performances of the WPTS.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125036334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-06-01DOI: 10.1109/ISFEE.2016.7803153
S. Can, A. Yılmaz
In this study, metasurface impact on a single horn antenna evaluated in terms of gain, directivity, far field, bandwidth and operating frequencies. Hexagon shaped split ring resonator is scaled and used for comparison of the single horn and metasurface loaded horn. For this purpose, a single horn at a frequency of 10GHz proposed. The hexagon shaped split ring resonator is designed to have periodic boundary conditions and after performing effective permittivity and permeability retrievals via a version of the Nicholson-Ross-Weir (NRW) algorithm that is improved by implementing the Kramers-Kronig relationship an finite array has been proposed for practical use. Metasurface loaded horn antenna achieved to have better bandwidth value around 10GHz and satisfy better gain and directivity values.
{"title":"Bandwidth enhancement of a horn antenna at X-band by using metamaterials","authors":"S. Can, A. Yılmaz","doi":"10.1109/ISFEE.2016.7803153","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803153","url":null,"abstract":"In this study, metasurface impact on a single horn antenna evaluated in terms of gain, directivity, far field, bandwidth and operating frequencies. Hexagon shaped split ring resonator is scaled and used for comparison of the single horn and metasurface loaded horn. For this purpose, a single horn at a frequency of 10GHz proposed. The hexagon shaped split ring resonator is designed to have periodic boundary conditions and after performing effective permittivity and permeability retrievals via a version of the Nicholson-Ross-Weir (NRW) algorithm that is improved by implementing the Kramers-Kronig relationship an finite array has been proposed for practical use. Metasurface loaded horn antenna achieved to have better bandwidth value around 10GHz and satisfy better gain and directivity values.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"274 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133547338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-06-01DOI: 10.1109/ISFEE.2016.7803236
D. Micu, T. Micu
The paper presents a way to determine the image charges in the case of a point charge in the presence of two grounded conductive spheres. The result is used for the computation of the electric scalar potential in a point. We show that, through an inversion transformation, the problem of the potential of a point charge in the presence of a plane and a sphere is reduced to the preceding problem. The solution was obtained with the help of a few C++ programs. The results are useful in the field of electrostatic separators.
{"title":"The potential of a punctual charge in the presence of two conductive surfaces","authors":"D. Micu, T. Micu","doi":"10.1109/ISFEE.2016.7803236","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803236","url":null,"abstract":"The paper presents a way to determine the image charges in the case of a point charge in the presence of two grounded conductive spheres. The result is used for the computation of the electric scalar potential in a point. We show that, through an inversion transformation, the problem of the potential of a point charge in the presence of a plane and a sphere is reduced to the preceding problem. The solution was obtained with the help of a few C++ programs. The results are useful in the field of electrostatic separators.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116790355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-06-01DOI: 10.1109/ISFEE.2016.7803188
S. Rachev, D. Koeva, I. Ivanov
The induction electric motor develops in transient processes significant sized electromagnetic torques, several times exceeding rated, starting and even maximum ones. These torques are the reason for the occurrence of dangerous mechanical stresses in the elements of the kinematic chain of electromechanical system. They should be considered when assessing the reliability of operation of the electric drive. The nature of the flow of transient processes in the electrical machine often determines the behavior of the entire system, an element of which is the machine. Paper deals with transient processes when starting a powerful electric drive for pump unit. The influence of the supply voltage and the total torque of inertia of the electric drive on arising impact torques and currents and starting time have been investigated.
{"title":"Electromechanical model and operating modes of high-voltage induction motor electric drive — Part I: Impact torque and currents","authors":"S. Rachev, D. Koeva, I. Ivanov","doi":"10.1109/ISFEE.2016.7803188","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803188","url":null,"abstract":"The induction electric motor develops in transient processes significant sized electromagnetic torques, several times exceeding rated, starting and even maximum ones. These torques are the reason for the occurrence of dangerous mechanical stresses in the elements of the kinematic chain of electromechanical system. They should be considered when assessing the reliability of operation of the electric drive. The nature of the flow of transient processes in the electrical machine often determines the behavior of the entire system, an element of which is the machine. Paper deals with transient processes when starting a powerful electric drive for pump unit. The influence of the supply voltage and the total torque of inertia of the electric drive on arising impact torques and currents and starting time have been investigated.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116114264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-06-01DOI: 10.1109/ISFEE.2016.7803168
M. I. Neacă, A. Neaca
This paper presents a methodology for estimating the losses occurring inside an inverter with full controlled bridge supply for supplying a BLDC motor. The motor drives a small vehicle. The PWM inverter supply voltages on the three phases starting from an accumulator battery and is made with MOSFET transistors. The proposed method presents a method of determining the losses of a transistor located on top of the three-phase bridge and a transistor located on the bottom of the bridge. It is based on the use of data from the catalog sheet specified by the manufacturer of the power transistor. To facilitate the understanding and application of the calculation of losses in various types of MOSFET we choose to complete the equations with numerical values determined based on the catalog sheet of the transistor which fits the analyzed inverter. Note that the precision of the results provided by the methodology proposed in the paper can be improved if one takes into account changing some transistor parameters due to its heating. The methodology was designed in order to allow the implementation of a MATLAB-SIMULINK system integrated with modeling and simulation systems of the inverters for motor supplying.
{"title":"Determination of the power loss in inverters which supplies a BLDC motor","authors":"M. I. Neacă, A. Neaca","doi":"10.1109/ISFEE.2016.7803168","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803168","url":null,"abstract":"This paper presents a methodology for estimating the losses occurring inside an inverter with full controlled bridge supply for supplying a BLDC motor. The motor drives a small vehicle. The PWM inverter supply voltages on the three phases starting from an accumulator battery and is made with MOSFET transistors. The proposed method presents a method of determining the losses of a transistor located on top of the three-phase bridge and a transistor located on the bottom of the bridge. It is based on the use of data from the catalog sheet specified by the manufacturer of the power transistor. To facilitate the understanding and application of the calculation of losses in various types of MOSFET we choose to complete the equations with numerical values determined based on the catalog sheet of the transistor which fits the analyzed inverter. Note that the precision of the results provided by the methodology proposed in the paper can be improved if one takes into account changing some transistor parameters due to its heating. The methodology was designed in order to allow the implementation of a MATLAB-SIMULINK system integrated with modeling and simulation systems of the inverters for motor supplying.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123553480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-06-01DOI: 10.1109/ISFEE.2016.7803229
Ozlem Ozden, Yanki Duru, S. Zengin, M. Boztepe
Digital controlled SMPS's (Switched Mode Power Supply) have many benefits and advantages. Nowadays they are highly preferred instead of analog (linear) power supplies due to their high efficiency, small size, and flexibility. In this paper a buck converter which has an output voltage of 0-30V and output current of 0-5A is designed step by step. At this process its calculations and simulations are performed. This converter can process in constant voltage and constant current modes. Also a PV (Photovoltaic) Simulator which can simulate the power output characteristics of various PV panels is added to our device. Lastly, a MATLAB GUI interface is designed to communicate with computer for obtaining the desired PV characteristic.
{"title":"Design and implementation of programmable PV simulator","authors":"Ozlem Ozden, Yanki Duru, S. Zengin, M. Boztepe","doi":"10.1109/ISFEE.2016.7803229","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803229","url":null,"abstract":"Digital controlled SMPS's (Switched Mode Power Supply) have many benefits and advantages. Nowadays they are highly preferred instead of analog (linear) power supplies due to their high efficiency, small size, and flexibility. In this paper a buck converter which has an output voltage of 0-30V and output current of 0-5A is designed step by step. At this process its calculations and simulations are performed. This converter can process in constant voltage and constant current modes. Also a PV (Photovoltaic) Simulator which can simulate the power output characteristics of various PV panels is added to our device. Lastly, a MATLAB GUI interface is designed to communicate with computer for obtaining the desired PV characteristic.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130016127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-06-01DOI: 10.1109/ISFEE.2016.7803206
Ruxandra Bărbulescu
The simulation of extracellular fields is a fundamental method in computational neuroscience. One of the most important factors for the extracellular field understanding is the action potential propagation in axons. The FitzHugh-Nagumo (FHN) equations are used to model and simulate the propagation of action potential in a single axon in Comsol Multiphysics 5.2®. The model is validated against a reference model and the electric potential propagation is observed by `freezing' the simulation at three different times. The paper discusses and makes new observations on the effect of FHN model parameters α, ε, β, γ and δ on the propagation of action potential along the axon.
{"title":"Simulation of electric potential in 3D neuronal axon","authors":"Ruxandra Bărbulescu","doi":"10.1109/ISFEE.2016.7803206","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803206","url":null,"abstract":"The simulation of extracellular fields is a fundamental method in computational neuroscience. One of the most important factors for the extracellular field understanding is the action potential propagation in axons. The FitzHugh-Nagumo (FHN) equations are used to model and simulate the propagation of action potential in a single axon in Comsol Multiphysics 5.2®. The model is validated against a reference model and the electric potential propagation is observed by `freezing' the simulation at three different times. The paper discusses and makes new observations on the effect of FHN model parameters α, ε, β, γ and δ on the propagation of action potential along the axon.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130111810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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